Altech Corporation 3B40UM Circuit Breaker - Equivalent & Substitute Parts

Part Overview

The 3B40UM is a thermal magnetic circuit breaker manufactured by Altech Corporation, rated for 40A at 480V AC and 60V DC. This three-pole DIN rail-mounted device features lever actuation and is designed for industrial electrical distribution applications. The product maintains active status with full compliance to ROHS3 and REACH standards. Substitute parts become necessary when specific thermal-magnetic characteristics, approval agency requirements, or supply chain considerations require alternative models within the same electrical and mechanical parameter set.

Substiute Parts

3B40UM

Altech CorporationIn Stock: 9493B40UM Datasheet

Current PartRFQ

3C40UM

Altech CorporationIn Stock: 10253C40UM Datasheet

Parametric EquivalentRFQ

3E40UM

Altech CorporationIn Stock: 7873E40UM Datasheet

Parametric EquivalentRFQ

3Z40UM

Altech CorporationIn Stock: 9633Z40UM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The 3B40UM circuit breaker has three parametric equivalents within the Altech V-EA series: 3C40UM, 3E40UM, and 3Z40UM. All four parts share identical electrical and mechanical specifications:

• Current Rating: 40A
• Voltage Ratings: 480V AC / 60V DC
• Mounting: DIN Rail, three-pole configuration
• Actuation: Lever-operated thermal magnetic mechanism
• Compliance: ROHS3 Compliant, REACH Unaffected

The substitution logic is based strictly on these matching parameters. The primary differentiator among these parts is the thermal-magnetic characteristic designation (B, C, E, or Z), which defines the trip curve behavior. All parts are manufactured by Altech Corporation, packaged in bulk, and maintain active product status. Approval agency certifications vary between CSA+UL508 (3B40UM, 3E40UM, 3Z40UM) and UL508 only (3C40UM).

Parameter Comparison

Engineering Selection Recommendations

All four circuit breaker models (3B40UM, 3C40UM, 3E40UM, 3Z40UM) are functionally equivalent based on electrical ratings, mechanical mounting, and core operational parameters. Selection among these parts should be determined by:

1. Approval Agency Requirements: If CSA certification is mandated, select from 3B40UM, 3E40UM, or 3Z40UM. The 3C40UM carries UL508 certification only.

2. Thermal-Magnetic Characteristic: The B, C, E, and Z designations specify distinct trip curve profiles. Application requirements must dictate which characteristic is appropriate for the intended circuit protection scheme.

3. Inventory Availability: Current stock levels are 858 units (3B40UM), 936 units (3C40UM), 741 units (3E40UM), and 858 units (3Z40UM).

4. Regulatory Compliance: All parts maintain ROHS3 compliance and REACH unaffected status, suitable for applications subject to these standards.

Frequently Asked Questions (FAQ)

Q: Can 3C40UM replace 3B40UM in applications requiring CSA certification?

A: No. The 3C40UM carries UL508 approval only, while 3B40UM includes CSA certification. If CSA approval is a requirement, use 3B40UM, 3E40UM, or 3Z40UM.

Q: Are all four models mechanically interchangeable on DIN rail installations?

A: Yes. All models feature identical DIN rail mounting specifications, three-pole configuration, and lever actuation. Physical installation is interchangeable.

Q: What determines the choice between B, C, E, and Z characteristic designations?

A: The thermal-magnetic characteristic defines the trip curve behavior and response time to overcurrent conditions. Selection depends on the specific circuit protection requirements and load characteristics of the application.

Q: Do all substitute parts meet the same electrical ratings?

A: Yes. All four models are rated for 40A at 480V AC and 60V DC with identical voltage and current specifications.

Q: Are there packaging differences among these substitute parts?

A: No. All four models are supplied in bulk packaging with no differentiation in package configuration.